JP2018063076A

JP2018063076A - Heat exchanger

Info

Publication number: JP2018063076A
Application number: JP2016201650A
Authority: JP
Inventors: 勝則酒井; Katsunori Sakai; 卓也岩本; Takuya Iwamoto
Original assignee: T Rad Co Ltd
Current assignee: T Rad Co Ltd
Priority date: 2016-10-13
Filing date: 2016-10-13
Publication date: 2018-04-19

Abstract

【課題】入口ヘッダ近傍の被加熱流体の沸騰を防止すると共に、対向流を実現する。【解決手段】入口ヘッダ（４）に隣接して被加熱液（７）の入口（１５)および出口（１６）が設けられ、各偏平チューブ（１）の厚み方向の両外面側であって、入口ヘッダ（４）に平行に設けた第１流路（１１）に第１熱交換部（８）が形成され、その第１流路（１１）の流通方向の端から下流方向に第２流路（１３）が設けられ、第１熱交換部（８）の下流側で、第１流路（１１）と第２流路（１３）とで囲まれた位置に、第２熱交換部（９）が設けられ、被加熱液（７）は、第１流路（１１）から第２流路（１３）の端をＵターンして、前記出口（１６）に導かれ、前記第２熱交換部（９）では、被加熱液（７）と熱媒体（６）が互いに対向流になるように流通される。【選択図】図１PROBLEM TO BE SOLVED: To prevent boiling of a fluid to be heated in the vicinity of an inlet header and to realize a countercurrent. An inlet (15) and an outlet (16) of a liquid to be heated (7) are provided adjacent to an inlet header (4), and are on both outer surface sides in the thickness direction of each flat tube (1). The first heat exchange section (8) is formed in the first flow path (11) provided parallel to the inlet header (4), and the second flow is downstream from the end of the first flow path (11) in the flow direction. The second heat exchange section (13) is provided at a position on the downstream side of the first heat exchange section (8) and surrounded by the first flow path (11) and the second flow path (13). 9) is provided, and the liquid to be heated (7) is guided to the outlet (16) by making a U-turn from the end of the first flow path (11) to the second flow path (13), and the second heat. In the exchange section (9), the liquid to be heated (7) and the heat medium (6) are circulated so as to be opposed to each other. [Selection diagram] Fig. 1

Description

本発明は、排ガスを熱源とした温水器に最適な熱交換器に関する。 The present invention relates to a heat exchanger optimal for a water heater using exhaust gas as a heat source.

高温の排ガスにより、水道水を加熱して温水を得る熱交換器が存在する。
熱交換器の効率を向上させるためには、排ガスと水道水はその流通方向を逆向きに流通させた対向流が好ましい。
図９は、その一例を示す熱交換器である。この例は、偏平チューブ１の積層体によりコアを形成し、そのコアの外周にケーシング３を被嵌すると共に、コアの両端に入口ヘッダ４と出口ヘッダ５とを配置したものである。そして、出口ヘッダ５側に被加熱液７の入口パイプ２５を配置し、入口ヘッダ４側に出口パイプ２６を配置する。さらには、各偏平チューブ１の外面にディンプル２９を複数配置し、入口パイプ２５から被加熱液７を各偏平チューブ１の外面側に供給する。そして、偏平チューブ１の内面側に熱媒体６を入口ヘッダ４から出口ヘッダ５に供給し、熱媒体６と被加熱液７とを対向流によって熱交換させるものである。 There are heat exchangers that obtain hot water by heating tap water with high-temperature exhaust gas.
In order to improve the efficiency of the heat exchanger, the counter flow in which the exhaust gas and tap water are circulated in opposite directions is preferable.
FIG. 9 shows a heat exchanger as an example. In this example, a core is formed by a laminated body of flat tubes 1, a casing 3 is fitted on the outer periphery of the core, and an inlet header 4 and an outlet header 5 are disposed at both ends of the core. And the inlet pipe 25 of the liquid 7 to be heated is arranged on the outlet header 5 side, and the outlet pipe 26 is arranged on the inlet header 4 side. Further, a plurality of dimples 29 are arranged on the outer surface of each flat tube 1, and the heated liquid 7 is supplied from the inlet pipe 25 to the outer surface side of each flat tube 1. Then, the heat medium 6 is supplied from the inlet header 4 to the outlet header 5 on the inner surface side of the flat tube 1, and the heat medium 6 and the liquid 7 to be heated are exchanged by counterflow.

特開２０１０−１３９１８５号公報JP 2010-139185 A

図９に示すように、熱媒体６と被加熱液７とを対向流とすると、高温の熱媒体６の流入側である入口ヘッダ４の近傍の偏平チューブ１に局部沸騰が生じると共に、被加熱液７、一般に水道水が使用されるが、所定の温度以上になると水道水中に含まれるカルシウムがそこで析出し、流路の詰まりの原因となる。
それと共に、各偏平チューブ１の寿命を低下させる欠点がある。
本発明は、係る欠点を防止すると共に、熱交換性能の良い熱交換器を提供することを課題とする。 As shown in FIG. 9, when the heat medium 6 and the liquid 7 to be heated are opposed to each other, local boiling occurs in the flat tube 1 near the inlet header 4 on the inflow side of the high-temperature heat medium 6 and Although the liquid 7, generally tap water is used, when the temperature exceeds a predetermined temperature, calcium contained in the tap water precipitates there, causing clogging of the flow path.
At the same time, there is a drawback that the life of each flat tube 1 is reduced.
This invention makes it a subject to provide the heat exchanger with good heat exchange performance while preventing the fault which concerns.

請求項１に記載の本発明は、偏平チューブ（１）の積層体からなるコア（２）の外周にケーシング（３）が被嵌され、そのコア（２）の両端に熱媒体（６）の入口ヘッダ（４）および出口ヘッダ（５）が配置され、
熱媒体（６）が入口ヘッダ（４）から出口ヘッダ（５）に各偏平チューブ（１）の内側を流通すると共に、前記ケーシング（３）を介して偏平チューブ（１）の外側に被加熱液（７）が導かれて、熱媒体（６）と被加熱液（７）との間で熱交換される熱交換器において、
前記入口ヘッダ（４）に隣接して、ケーシング（３）に被加熱液（７）の入口（１５）が配置されると共に、その入口（１５）の下流側であって、前記入口ヘッダ（４）に近い位置に被加熱液（７）の出口（１６）が設けられ、
各偏平チューブ（１）の厚み方向の両外面側であって、前記入口ヘッダ（４）に平行に設けた第１流路（１１）と、その第１流路（１１）の流通方向の端から前記熱媒体（６）の下流方向で、各偏平チューブ（１）の幅方向の一方側の側縁に沿って設けた第２流路（１３）と、を具備し、
前記第１流路（１１）の位置に、被加熱液（７）と熱媒体（６）とが熱交換される第１熱交換部（８）が形成され、
前記第１熱交換部（８）の前記熱媒体（６）の流通方向の下流側で、第１流路（１１）と第２流路（１３）とで囲まれた位置に、被加熱液（７）と熱媒体（６）とが熱交換される第２熱交換部（９）が設けられ、
前記被加熱液（７）は、第１流路（１１）から第２流路（１３）の端をＵターンして、前記出口（１６）に導かれ、前記第２熱交換部（９）では、被加熱液（７）と熱媒体（６）が互いに対向流になるように流通される熱交換器。 According to the first aspect of the present invention, a casing (3) is fitted on the outer periphery of a core (2) made of a laminated body of flat tubes (1), and the heat medium (6) is attached to both ends of the core (2). An inlet header (4) and an outlet header (5) are arranged;
The heat medium (6) flows from the inlet header (4) to the outlet header (5) inside each flat tube (1), and the liquid to be heated is placed outside the flat tube (1) via the casing (3). In the heat exchanger in which (7) is guided and heat is exchanged between the heat medium (6) and the liquid to be heated (7),
The inlet (15) of the liquid to be heated (7) is disposed in the casing (3) adjacent to the inlet header (4), and is downstream of the inlet (15), and the inlet header (4). ) Is provided with an outlet (16) for the liquid to be heated (7),
A first flow path (11) provided in parallel to the inlet header (4) on both outer surface sides in the thickness direction of each flat tube (1), and an end in the flow direction of the first flow path (11) A second flow path (13) provided along one side edge in the width direction of each flat tube (1) in the downstream direction of the heat medium (6),
At the position of the first flow path (11), a first heat exchange section (8) is formed in which the liquid to be heated (7) and the heat medium (6) exchange heat,
The liquid to be heated is positioned downstream of the first heat exchange section (8) in the flow direction of the heat medium (6) and surrounded by the first flow path (11) and the second flow path (13). A second heat exchange section (9) for exchanging heat between (7) and the heat medium (6);
The heated liquid (7) is U-turned from the first flow path (11) to the second flow path (13) and guided to the outlet (16), and the second heat exchange section (9). Then, the heat exchanger which distribute | circulates so that a to-be-heated liquid (7) and a heat medium (6) may become mutually opposing flow.

請求項２に記載の本発明は、請求項１に記載の熱交換器において、
前記各偏平チューブ（１）は、長手方向の両端を厚み方向へ膨出した膨出部（１０）を有し、各偏平チューブ（１）が前記膨出部（１０）で積層されてヘッダープレートのない、ヘッダプレートレス型の熱交換器が形成され、
各偏平チューブ（１）の厚み方向の両外面にあって、前記膨出部（１０）に平行に設けられた第１流路（１１）を介して、前記入口（１５）から各偏平チューブ（１）の幅方向の一方の端部の手前まで、前記流通方向に直交する方向に第１リブ（１２）が前記膨出部（１０）の高さに突出され、その第１流路（１１）の位置に前記第１熱交換部（８）が形成され、
第１リブ（１２）の端から各偏平チューブ（１）の幅方向の前記一方の端縁に沿う第２流路（１３）を介して、熱媒体（６）の流通方向の下流側の端部の手前まで、第２リブ（１４）が前記膨出部（１０）の高さに突出され、前記第１流路（１１）の前記下流側で、第１流路（１１）と第２流路（１３）で囲まれた位置に第２熱交換部（９）が形成され、
各偏平チューブ（１）の第１リブ（１２）の頂部どうし及び、第２リブ（１４）の頂部どうしが互いに接触して各偏平チューブ（１）間に被加熱液（７）の誘導路が形成された熱交換器である。 According to a second aspect of the present invention, in the heat exchanger according to the first aspect,
Each of the flat tubes (1) has a bulging portion (10) that bulges both ends in the longitudinal direction in the thickness direction, and each flat tube (1) is laminated at the bulging portion (10) to form a header plate. Without a header plateless heat exchanger,
Each flat tube (1) is connected to each flat tube (1) through the first flow path (11) provided on both outer surfaces in the thickness direction of the flat tube (1) and parallel to the bulging portion (10). The first rib (12) protrudes to the height of the bulging portion (10) in the direction orthogonal to the flow direction up to one end in the width direction of 1), and the first flow path (11 ) At the position of the first heat exchange part (8),
The downstream end in the flow direction of the heat medium (6) through the second flow path (13) along the one end edge in the width direction of each flat tube (1) from the end of the first rib (12) The second rib (14) protrudes to the height of the bulging part (10) up to the front of the part, and on the downstream side of the first flow path (11), the first flow path (11) and the second flow path A second heat exchange section (9) is formed at a position surrounded by the flow path (13),
The tops of the first ribs (12) of the flat tubes (1) and the tops of the second ribs (14) are in contact with each other, and a guide path for the heated liquid (7) is formed between the flat tubes (1). It is a formed heat exchanger.

請求項３に記載の本発明は、請求項１に記載の熱交換器において、
前記各偏平チューブ（１）は、長手方向の両端を厚み方向へ膨出した膨出部（１０）を有し、各偏平チューブ（１）が前記膨出部（１０）で積層されてヘッダープレートのない、ヘッダプレートレス型の熱交換器が形成され、
各偏平チューブ（１）の厚み方向の両外面にあって、前記膨出部（１０）に平行に設けられた第１流路（１１）を介して、前記入口（１５）から各偏平チューブ（１）の幅方向の前記一方の端部の手前まで、前記流通方向に直交する方向に第１リブ（１２）が前記膨出部（１０）の高さに突出され、
その第１流路（１１）の端部に接続するように、第１流路（１１）に平行な補助流路（１７）を介して、補助リブ（１８）が形成され、その補助流路（１７）と前記第１流路（１１）とで第１熱交換部（８）が形成され、
その補助流路（１７）の前記偏平チューブ（１）の幅方向の他方の端部から、熱媒体（６）の流通方向の下流側の端部の手前まで、偏平チューブ（１）の幅方向の他方の端縁に沿う第３流路（１９）が形成され、その第３流路（１９）を介して第３リブ（２０）が形成され、
前記補助流路（１７）と第３流路（１９）で囲まれた位置に、第２熱交換部（９）が形成され、
前記被加熱液（７）は、第３流路（１９）の端をＵターンして、前記出口（１６）に導かれ、前記第２熱交換部（９）では、被加熱液（７）と熱媒体（６）が互いに対向流になるように流通される熱交換器である。 A third aspect of the present invention provides the heat exchanger according to the first aspect,
Each of the flat tubes (1) has a bulging portion (10) that bulges both ends in the longitudinal direction in the thickness direction, and each flat tube (1) is laminated at the bulging portion (10) to form a header plate. Without a header plateless heat exchanger,
Each flat tube (1) is connected to each flat tube (1) through the first flow path (11) provided on both outer surfaces in the thickness direction of the flat tube (1) and parallel to the bulging portion (10). The first rib (12) protrudes to the height of the bulging portion (10) in a direction perpendicular to the flow direction until just before the one end in the width direction of 1),
An auxiliary rib (18) is formed via an auxiliary flow path (17) parallel to the first flow path (11) so as to be connected to the end of the first flow path (11). (17) and the first flow path (11) form a first heat exchange section (8),
The width direction of the flat tube (1) from the other end in the width direction of the flat tube (1) of the auxiliary flow path (17) to the front of the downstream end in the flow direction of the heat medium (6). A third flow path (19) is formed along the other edge of the second rib, and a third rib (20) is formed through the third flow path (19).
A second heat exchange section (9) is formed at a position surrounded by the auxiliary flow path (17) and the third flow path (19),
The heated liquid (7) makes a U-turn at the end of the third flow path (19) and is guided to the outlet (16). In the second heat exchange section (9), the heated liquid (7) And the heat medium (6) are circulated so as to face each other.

請求項４に記載の本発明は、請求項１に記載の熱交換器において、
前記各偏平チューブ（１）の両端が、前記入口ヘッダ（４）、出口ヘッダ（５）を構成するヘッダープレート（２１）のチューブ挿通孔（２２）に挿通されたヘッダープレート付きの熱交換器であって、
各偏平チューブ（１）の幅方向の両縁に前記ケーシング（３）の内面が接触し、各偏平チューブ（１）の厚み方向の両外面にあって、前記ヘッダープレート（２１）に平行に設けられた第１流路（１１）を介して、前記入口（１５）から各偏平チューブ（１）の幅方向の一方の端部の手前まで、前記流通方向に直交する方向に第１リブ（１２）が突出され、前記第１流路（１１）の位置に前記第１熱交換部（８）が形成され、
第１リブ（１２）の端から偏平チューブ（１）の幅方向の前記一方の端縁に沿う第２流路（１３）を介して、熱媒体（６）の流通方向の下流側の端部の手前まで、第２リブ（１４）が突出され、
前記第１熱交換部（８）の下流側で、前記第１流路（１１）と第２流路（１３）に囲まれた位置に、第２熱交換部（９）が形成され、
各偏平チューブ（１）の第１リブ（１２）の頂部どうし及び、第２リブ（１４）の頂部どうしが互いに接触して各偏平チューブ（１）間に被加熱液（７）の誘導路が形成された熱交換器である。 According to a fourth aspect of the present invention, in the heat exchanger according to the first aspect,
Each flat tube (1) is a heat exchanger with a header plate in which both ends of the flat tube (1) are inserted into the tube insertion holes (22) of the header plate (21) constituting the inlet header (4) and the outlet header (5). There,
The inner surface of the casing (3) is in contact with both edges in the width direction of each flat tube (1), is provided on both outer surfaces in the thickness direction of each flat tube (1), and is provided in parallel with the header plate (21). The first rib (12) in a direction perpendicular to the flow direction from the inlet (15) to the front of one end in the width direction of each flat tube (1) through the formed first flow path (11). ) Is projected, and the first heat exchange part (8) is formed at the position of the first flow path (11).
The downstream end of the heat medium (6) in the flow direction through the second flow path (13) along the one end edge in the width direction of the flat tube (1) from the end of the first rib (12) The second rib (14) protrudes until just before
A second heat exchange section (9) is formed at a position surrounded by the first flow path (11) and the second flow path (13) on the downstream side of the first heat exchange section (8),
The tops of the first ribs (12) of the flat tubes (1) and the tops of the second ribs (14) are in contact with each other, and a guide path for the heated liquid (7) is formed between the flat tubes (1). It is a formed heat exchanger.

請求項５に記載の本発明は、請求項１に記載の熱交換器において、
前記各偏平チューブ（１）の両端が、前記入口ヘッダ（４）、出口ヘッダ（５）を構成するヘッダープレート（２１）のチューブ挿通孔（２２）に挿通されたヘッダープレート付きの熱交換器であって、
各偏平チューブ（１）の幅方向の両縁に前記ケーシング（３）の内面が接触し、各偏平チューブ（１）の厚み方向の両外面にあって、前記ヘッダープレート（２１）に平行に設けられた第１流路（１１）を介して、前記入口（１５）から各偏平チューブ（１）の幅方向の前記一方の端部の手前まで、前記流通方向に直交する方向に第１リブ（１２）が突出され、
その第１流路（１１）の端部に接続するように、第１流路（１１）に平行な補助流路（１７）を介して、補助リブ（１８）が形成され、その補助流路（１７）と前記第１流路（１１）とで第１熱交換部（８）が形成され、
その補助流路（１７）の前記偏平チューブ（１）の幅方向の他方の端部から、熱媒体（６）の流通方向の下流側の端部の手前まで、偏平チューブ（１）の幅方向の他方の端縁に沿う第３流路（１９）が形成され、その第３流路（１９）を介して第３リブ（２０）が形成され、
前記第１熱交換部（８）の下流側で、前記補助流路（１７）と第３流路（１９）とで囲まれた位置に第２熱交換部（９）が形成され、
前記被加熱液（７）は、第３流路（１９）の端をＵターンして、前記出口（１６）に導かれ、第２熱交換部（９）では、被加熱液（７）と熱媒体（６）が互いに対向流になるように流通される熱交換器ある。 The present invention according to claim 5 is the heat exchanger according to claim 1,
Each flat tube (1) is a heat exchanger with a header plate in which both ends of the flat tube (1) are inserted into the tube insertion holes (22) of the header plate (21) constituting the inlet header (4) and the outlet header (5). There,
The inner surface of the casing (3) is in contact with both edges in the width direction of each flat tube (1), is provided on both outer surfaces in the thickness direction of each flat tube (1), and is provided in parallel with the header plate (21). The first rib (in the direction perpendicular to the flow direction from the inlet (15) to the front of the one end in the width direction of each flat tube (1) through the formed first flow path (11). 12) is projected,
An auxiliary rib (18) is formed via an auxiliary flow path (17) parallel to the first flow path (11) so as to be connected to the end of the first flow path (11). (17) and the first flow path (11) form a first heat exchange section (8),
The width direction of the flat tube (1) from the other end in the width direction of the flat tube (1) of the auxiliary flow path (17) to the front of the downstream end in the flow direction of the heat medium (6). A third flow path (19) is formed along the other edge of the second rib, and a third rib (20) is formed through the third flow path (19).
A second heat exchange section (9) is formed at a position surrounded by the auxiliary flow path (17) and the third flow path (19) on the downstream side of the first heat exchange section (8),
The heated liquid (7) makes a U-turn at the end of the third flow path (19) and is led to the outlet (16). In the second heat exchange section (9), the heated liquid (7) and It is a heat exchanger which distribute | circulates so that a heat carrier (6) may mutually counter flow.

請求項１に記載の発明は、入口ヘッダ（４）に隣接して被加熱液（７）の入口（１５)および出口（１６）が設けられ、
各偏平チューブ（１）の厚み方向の両外面側であって、入口ヘッダ（４）に平行に設けた第１流路（１１）に第１熱交換部（８）が形成され、
その第１流路（１１）の流通方向の端から下流方向に第２流路（１３）が設けられ、
第１熱交換部（８）の下流側で、第１流路（１１）と第２流路（１３）とで囲まれた位置に、第２熱交換部（９）が設けられ、
被加熱液（７）は、第１流路（１１）から第２流路（１３）の端をＵターンして、前記出口（１６）に導かれ、前記第２熱交換部（９）では、被加熱液（７）と熱媒体（６）が互いに対向流になるように流通されるものである。
従って、被加熱液（７）の入口（１５）および、出口（１６）を入口ヘッダ（４）に隣接して配置しつつ、第２熱交換部（９）で、被加熱液（７）と熱媒体（６）を対向流になるように構成したので、熱交換性能を高めることができる。
そして、第１熱交換部（８）に、熱交換前の低温の被加熱液（７）を入口（１５）から供給して、入口ヘッダ（４）および偏平チューブ（１）の入口ヘッダ（４）側の端部を冷却して、その部分の沸騰の抑制と、被加熱液（７）中のカルシウムの付着、腐食の抑制をして、コアの寿命を高めることができる。 The invention according to claim 1 is provided with an inlet (15) and an outlet (16) of the liquid to be heated (7) adjacent to the inlet header (4),
A first heat exchange section (8) is formed in the first flow path (11) provided on both outer surface sides in the thickness direction of each flat tube (1) and parallel to the inlet header (4),
The second flow path (13) is provided in the downstream direction from the end in the flow direction of the first flow path (11),
A second heat exchange section (9) is provided at a position surrounded by the first flow path (11) and the second flow path (13) on the downstream side of the first heat exchange section (8),
The liquid to be heated (7) makes a U-turn at the end of the second flow path (13) from the first flow path (11) and is guided to the outlet (16). In the second heat exchange section (9), The liquid to be heated (7) and the heat medium (6) are circulated so as to face each other.
Accordingly, while the inlet (15) and outlet (16) of the liquid to be heated (7) are arranged adjacent to the inlet header (4), the second heat exchange section (9) and the liquid to be heated (7) Since the heat medium (6) is configured to be a counterflow, the heat exchange performance can be enhanced.
And the low-temperature to-be-heated liquid (7) before heat exchange is supplied to the 1st heat exchange part (8) from the inlet (15), and the inlet header (4) and the inlet header (4) of the flat tube (1) ) Side end portion can be cooled to suppress the boiling of the portion and to suppress the adhesion and corrosion of calcium in the liquid to be heated (7), thereby extending the life of the core.

請求項２に記載の発明は、ヘッダプレートレス型の熱交換器において、
各偏平チューブ（１）の膨出部（１０）に平行な第１流路（１１）に第１リブ（１２）を形成し、その第１流路（１１）の位置に第１熱交換部（８）を設け、
第１リブ（１２）の端から熱媒体（６）の流通方向の下流側の端部の手前まで、第２リブ（１４）を設け、第１流路（１１）と第２流路（１３）で囲まれた位置に第２熱交換部（９）を形成する。そして、各偏平チューブ（１）の第１リブ（１２）の頂部どうし及び、第２リブ（１４）の頂部どうしが互いに接触して各偏平チューブ（１）間に被加熱液（７）の誘導路を形成したものである。
そして、各偏平チューブ（１）の外面側に設けた第１リブ（１２）の第１熱交換部（８）で、沸騰の抑制、コア寿命の延長を実現し、第２リブ（１４）のＵターン路を介して第２熱交換部（９）の対向流構成による熱交換器性能の向上を実現し、それらを簡単な構成で行える。 The invention according to claim 2 is a header plateless type heat exchanger,
A first rib (12) is formed in a first flow path (11) parallel to the bulging portion (10) of each flat tube (1), and the first heat exchange section is located at the position of the first flow path (11). (8) is provided,
A second rib (14) is provided from the end of the first rib (12) to the downstream end in the flow direction of the heat medium (6), and the first flow path (11) and the second flow path (13). ) To form the second heat exchange section (9). Then, the tops of the first ribs (12) and the tops of the second ribs (14) of each flat tube (1) come into contact with each other to induce the heated liquid (7) between the flat tubes (1). A road is formed.
And in the 1st heat exchange part (8) of the 1st rib (12) provided in the outer surface side of each flat tube (1), suppression of boiling and extension of a core life are realized, and the 2nd rib (14) Through the U-turn path, the heat exchanger performance is improved by the counter flow configuration of the second heat exchange section (9), and these can be performed with a simple configuration.

請求項３に記載の発明は、請求項１の構成に加えて、その第１流路（１１）の端部に接続するように、補助流路（１７）を介して、補助リブ（１８）が形成され、その補助流路（１７）と前記第１流路（１１）とで第１熱交換部（８）が形成され、
その補助流路（１７）の端部から、第３流路（１９）が形成され、その第３流路（１９）を介して第３リブ（２０）が形成され、
前記補助流路（１７）と第３流路（１９）で囲まれた位置に、第２熱交換部（９）が形成され、
前記被加熱液（７）は、第３流路（１９）の端をＵターンして、前記出口（１６）に導かれ、前記第２熱交換部（９）では、被加熱液（７）と熱媒体（６）が互いに対向流になるように流通されるものである。
本請求項の構成では、被加熱液（７）の入口（１５）と出口（１６）が、ケーシング（３）の反対側の側面に配置されるように形成される。これにより、請求項１と同等の効果を有しながら、請求項１の構成で生じる被加熱液（７）の入口（１５）と出口（１６）が隣接することで、それぞれシステム側配管との接続スペースを確保できない課題に対し、余裕を持って配管接続が可能となる。 In addition to the structure of claim 1, the invention according to claim 3 is provided with the auxiliary rib (18) via the auxiliary flow path (17) so as to be connected to the end of the first flow path (11). The auxiliary flow path (17) and the first flow path (11) form a first heat exchange section (8),
A third channel (19) is formed from the end of the auxiliary channel (17), and a third rib (20) is formed through the third channel (19).
A second heat exchange section (9) is formed at a position surrounded by the auxiliary flow path (17) and the third flow path (19),
The heated liquid (7) makes a U-turn at the end of the third flow path (19) and is guided to the outlet (16). In the second heat exchange section (9), the heated liquid (7) And the heat medium (6) are circulated so as to face each other.
In the structure of this claim, the inlet (15) and the outlet (16) of the liquid to be heated (7) are formed so as to be disposed on the opposite side surface of the casing (3). As a result, the inlet (15) and the outlet (16) of the liquid to be heated (7) generated in the configuration of claim 1 are adjacent to each other, while having the same effect as that of claim 1. Piping connection can be made with a margin for the problem that connection space cannot be secured.

請求項４に記載の発明は、ヘッダープレート（２１）付きの熱交換器であって、
各偏平チューブ（１）の厚み方向の両外面に形成された第１流路（１１）、第２流路（１３）、第１リブ（１２）、第２リブ（１４）、第１熱交換部（８）、第２熱交換部（９）が請求項１と同様に形成され、同様の効果を有するものである。 Invention of Claim 4 is a heat exchanger with a header plate (21),
1st flow path (11), 2nd flow path (13), 1st rib (12), 2nd rib (14), and 1st heat exchange which were formed in both the outer surfaces of the thickness direction of each flat tube (1) The part (8) and the second heat exchange part (9) are formed in the same manner as in the first aspect and have the same effect.

請求項５に記載の発明は、ヘッダープレート（２１)付きの熱交換器であって、
各偏平チューブ（１）の構成は請求項３に記載の構成と同様であると共に、その効果も同様である。 The invention according to claim 5 is a heat exchanger with a header plate (21),
The structure of each flat tube (1) is the same as the structure of Claim 3, and the effect is also the same.

本発明の第１実施例の熱交換器の縦断面平面図。The longitudinal cross-sectional top view of the heat exchanger of 1st Example of this invention. 同熱交換器の分解斜視図。The exploded perspective view of the heat exchanger. 同出口ヘッダ５を示す縦断面図。The longitudinal cross-sectional view which shows the exit header 5. FIG. 本発明の第２実施例の熱交換器の縦断面平面図であって、図１の実施例に水抜パイプ３１を付加したもの。It is a longitudinal cross-sectional top view of the heat exchanger of 2nd Example of this invention, Comprising: The drain pipe 31 is added to the Example of FIG. 本発明の第３実施例の熱交換器の縦断面平面図であって、図１の実施例に補助流路１７を付加したもの。It is a longitudinal cross-sectional top view of the heat exchanger of 3rd Example of this invention, Comprising: The auxiliary flow path 17 is added to the Example of FIG. 本発明の第４実施例の熱交換器の縦断面平面図であって、一対のヘッダープレート２１を各偏平チューブ１の両端に有するもの。It is a longitudinal cross-sectional top view of the heat exchanger of 4th Example of this invention, Comprising: A thing which has a pair of header plate 21 in the both ends of each flat tube 1. FIG. 図６のVII―VII矢視図。VII-VII arrow view of FIG. 図７のVIII―VIII矢視図。VIII-VIII arrow view of FIG. 従来型の熱交換器の縦断面平面図。The longitudinal cross-sectional top view of the conventional heat exchanger.

次に、図面に基づいて本発明の実施の形態につき説明する。
図１〜図３は本発明の第１実施例を示し、図１はその縦断面平面図、図２は同分解斜視図、図３はその出口ヘッダ５及びケーシング３の部分断面図。
この熱交換器は、図２に示す如く、多数の偏平チューブ１の積層体によりコア２を構成し、そのコア２の外周にケーシング３を被嵌すると共に、コア２の両端に入口ヘッダ４と出口ヘッダ５を配置したものである。
なお、この例ではケーシング３と入口ヘッダ４，出口ヘッダ５は一体に形成され、それらに上蓋２４が被嵌されるものである。 Next, embodiments of the present invention will be described with reference to the drawings.
1 to 3 show a first embodiment of the present invention, FIG. 1 is a longitudinal sectional plan view thereof, FIG. 2 is an exploded perspective view thereof, and FIG. 3 is a partial sectional view of an outlet header 5 and a casing 3 thereof.
As shown in FIG. 2, the heat exchanger includes a core 2 formed of a laminated body of a number of flat tubes 1, and a casing 3 is fitted on the outer periphery of the core 2, and inlet headers 4 are connected to both ends of the core 2. An outlet header 5 is arranged.
In this example, the casing 3, the inlet header 4, and the outlet header 5 are integrally formed, and the upper lid 24 is fitted thereon.

各偏平チューブ１は、夫々溝状に形成された一対のプレート１ａとプレート１ｂとの嵌着体からなると共に、その内部にインナーフィン３０が配置される。
各プレート１ａとプレート１ｂは、その長手方向の両端に厚み方向へ膨出部１０が突設されている。そして、その膨出部１０で各偏平チューブ１どうしが接合されてコア２を構成する。
さらに、各偏平チューブ１の厚み方向の両面には、第１リブ１２及び第２リブ１４がＬ字状に形成され、第１リブ１２と膨出部１０との間に第１流路１１が設けられ、そこに第１熱交換部８を形成する。 Each flat tube 1 is composed of a fitting body of a pair of plates 1a and 1b each formed in a groove shape, and an inner fin 30 is disposed therein.
Each plate 1a and plate 1b has bulging portions 10 projecting in the thickness direction at both ends in the longitudinal direction. And each flat tube 1 is joined by the bulging part 10, and the core 2 is comprised.
Furthermore, the first rib 12 and the second rib 14 are formed in an L shape on both surfaces in the thickness direction of each flat tube 1, and the first flow path 11 is provided between the first rib 12 and the bulging portion 10. The first heat exchange unit 8 is formed there.

また、第２リブ１４とケーシング３との間には第２流路１３が形成されている。第２リブ１４の先端は、その長手方向の一端の手前までに形成されている。
また、第１リブ１２はその幅方向の一端から他端の手前まで延び、第１リブ１２及び第２リブ１４の高さが膨出部１０の高さに形成されている。そして、第１流路１１と第２流路１３とで囲まれた平面内に第２熱交換部９が形成され、第２熱交換部９に多数のディンプル２９が突設されている。そして、入口ヘッダ４側で各偏平チューブ１の膨出部１０に隣接し入口パイプ２５が設けられ、そこに入口１５が形成される。また、入口パイプ２５の僅かに下流側に、入口パイプ２５から独立して出口パイプ２６が設けられ、そこに出口１６が形成される。 A second flow path 13 is formed between the second rib 14 and the casing 3. The tip of the second rib 14 is formed up to the front of one end in the longitudinal direction.
The first rib 12 extends from one end in the width direction to the front of the other end, and the height of the first rib 12 and the second rib 14 is formed to be the height of the bulging portion 10. The second heat exchange section 9 is formed in a plane surrounded by the first flow path 11 and the second flow path 13, and a large number of dimples 29 project from the second heat exchange section 9. And the inlet pipe 25 is provided adjacent to the bulging part 10 of each flat tube 1 in the inlet header 4 side, and the inlet 15 is formed there. Further, an outlet pipe 26 is provided slightly downstream of the inlet pipe 25 independently of the inlet pipe 25, and the outlet 16 is formed there.

そして、高温の排ガスからなる熱媒体６が入口ヘッダ４を介して各偏平チューブ１の内部に供給され、それが出口ヘッダ５から凝縮液パイプ２７及び排気パイプ２８を介して排出される。
また、水道水等の被加熱液７が入口１５から供給され、各偏平チューブ１の第１流路１１に供給され、それが第２流路１３を介して第２リブ１４の下端をＵターンして、第２熱交換部９に導かれる。導かれた被加熱液７は、排ガス６で加熱され、出口パイプ２６の出口１６から外部に流出する。
また、熱媒体６は被加熱液７と熱交換されて、その排ガスが出口ヘッダ５の排気パイプ２８から流出すると共に、凝縮水は出口ヘッダ５の凝縮液パイプ２７から外部に導かれる。なお、入口ヘッダ４にはフランジ２３が接合されている。 Then, the heat medium 6 made of high-temperature exhaust gas is supplied to the inside of each flat tube 1 via the inlet header 4, and is discharged from the outlet header 5 via the condensate pipe 27 and the exhaust pipe 28.
Further, the liquid 7 to be heated such as tap water is supplied from the inlet 15 and supplied to the first flow path 11 of each flat tube 1, and the U-turns the lower end of the second rib 14 through the second flow path 13. Then, it is guided to the second heat exchange unit 9. The guided liquid 7 to be heated is heated by the exhaust gas 6 and flows out from the outlet 16 of the outlet pipe 26.
The heat medium 6 exchanges heat with the liquid 7 to be heated, and the exhaust gas flows out from the exhaust pipe 28 of the outlet header 5, and the condensed water is guided to the outside from the condensate pipe 27 of the outlet header 5. A flange 23 is joined to the inlet header 4.

〔作用〕
入口パイプ２５の入口１５から導かれた被加熱液７は、先ず、各偏平チューブ１の外面側の第１流路１１に導かれ、そこに設けられた第１リブ１２とそれに続く第２リブ１４とに案内されて、第２熱交換部９に導かれる。そして、第１流路１１の第１熱交換部８を通過する間に熱媒体６と熱交換し、膨出部１０の近傍における局部沸騰を防止し、それに伴い被加熱液７が所定の温度以上で生じるカルシウムの析出を防止する。
次いで、被加熱液７は第２リブ１４をＵターンし第２熱交換部９に導かれ、出口パイプ２６の出口１６からそれが外部に流出される。このとき、被加熱液７は熱媒体６の流通方向と逆向きに形成され、対向流となって熱交換が促進される。 [Action]
The liquid 7 to be heated guided from the inlet 15 of the inlet pipe 25 is first guided to the first flow path 11 on the outer surface side of each flat tube 1, and the first rib 12 provided there and the second rib subsequent thereto. 14 and guided to the second heat exchange unit 9. Then, heat exchange with the heat medium 6 is performed while passing through the first heat exchanging portion 8 of the first flow path 11 to prevent local boiling in the vicinity of the bulging portion 10, and accordingly, the liquid 7 to be heated has a predetermined temperature. This prevents calcium precipitation.
Next, the liquid 7 to be heated makes a U-turn on the second rib 14 and is guided to the second heat exchanging portion 9, and it flows out to the outside from the outlet 16 of the outlet pipe 26. At this time, the liquid 7 to be heated is formed in a direction opposite to the flow direction of the heat medium 6 and becomes a counter flow to promote heat exchange.

次に、図４は発明の第２実施例であり、出口ヘッダ５に隣接した位置に水抜パイプ３１が設けられ、熱交換器をシステムの一部として利用したとき、その停止時の水抜きを行うものである。 Next, FIG. 4 shows a second embodiment of the invention. When a drain pipe 31 is provided at a position adjacent to the outlet header 5 and the heat exchanger is used as a part of the system, draining at the time of stopping is performed. Is what you do.

次に、図５は本発明の第３実施例であり、この例が図１のそれと異なる点は、第１流路１１に平行に補助流路１７が設けられ、その補助流路１７を形成する補助リブ１８が突設されている。その補助リブ１８は、偏平チューブ１の幅方向の一端から他端の手前まで延び、そこから第３リブ２０に接続されている。そして、その第３リブ２０とケーシング３との間に第３流路１９が形成されている。
従って、この例が図１と異なる点は、被加熱液７の折り返し用の補助リブ１８及び補助流路１７が形成されている点である。 Next, FIG. 5 shows a third embodiment of the present invention. This example is different from that of FIG. 1 in that an auxiliary channel 17 is provided in parallel to the first channel 11 to form the auxiliary channel 17. Auxiliary ribs 18 are provided to project. The auxiliary rib 18 extends from one end of the flat tube 1 in the width direction to the front of the other end, and is connected to the third rib 20 therefrom. A third flow path 19 is formed between the third rib 20 and the casing 3.
Therefore, this example is different from FIG. 1 in that auxiliary ribs 18 and auxiliary flow passages 17 for folding the liquid 7 to be heated are formed.

さらに、各偏平チューブ１の幅方向の一端側に入口パイプ２５が、他端側に出口パイプ２６が設けられ、入口パイプ２５に入口１５が、出口パイプ２６に出口１６が形成されている。そして、被加熱液７は各偏平チューブ１の外面の第１流路１１及び補助流路１７を折り返し第３流路１９に導かれて、各偏平チューブ１の下流端側をＵターンして出口パイプ２６の出口１６に導かれるものである。その出口パイプ２６は、第１流路１１の下流側で、入口ヘッダ４に近い位置にある。
この例では、第１流路１１と補助流路１７とにより第１熱交換部８を形成する。そしてその第１熱交換部８よって、各偏平チューブ１の入口ヘッダ４側の局部沸騰及びカルシウムの析出を効果的に防止するものである。 Further, an inlet pipe 25 is provided on one end side in the width direction of each flat tube 1, an outlet pipe 26 is provided on the other end side, an inlet 15 is formed on the inlet pipe 25, and an outlet 16 is formed on the outlet pipe 26. Then, the liquid 7 to be heated is guided back to the third flow path 19 by folding the first flow path 11 and the auxiliary flow path 17 on the outer surface of each flat tube 1, and makes a U-turn on the downstream end side of each flat tube 1. It is led to the outlet 16 of the pipe 26. The outlet pipe 26 is located near the inlet header 4 on the downstream side of the first flow path 11.
In this example, the first heat exchange section 8 is formed by the first flow path 11 and the auxiliary flow path 17. The first heat exchanging portion 8 effectively prevents local boiling and calcium precipitation on the inlet header 4 side of each flat tube 1.

次に、図６〜図８は本発明の第４実施例であり、この実施例が図１のそれと異なる点は、ケーシング３の両端に一対のヘッダープレート２１が設けられ、そのヘッダープレート２１に穿設されたチューブ挿通孔２２に偏平チューブ１の両端が挿通固定されている点である。この例においても、各偏平チューブ１には第１リブ１２と第２リブ１４と第１流路１１と第２流路１３とが形成されている。各偏平チューブ１の形状は図１のそれと同じである。
第１流路１１は第１リブ１２とヘッダープレート２１との間に形成され、第２流路１３は第２リブ１４とケーシング３との間に形成されている。そして、熱媒体６が入口ヘッダ４から各偏平チューブ１の内部を流通し、被加熱液７が入口１５から各偏平チューブ１の外面側に導かれる。 Next, FIGS. 6 to 8 show a fourth embodiment of the present invention. This embodiment is different from that of FIG. 1 in that a pair of header plates 21 are provided at both ends of the casing 3, and Both ends of the flat tube 1 are inserted into and fixed to the tube insertion hole 22 formed. Also in this example, each flat tube 1 is formed with the first rib 12, the second rib 14, the first flow path 11, and the second flow path 13. The shape of each flat tube 1 is the same as that of FIG.
The first flow path 11 is formed between the first rib 12 and the header plate 21, and the second flow path 13 is formed between the second rib 14 and the casing 3. Then, the heat medium 6 flows through the inside of each flat tube 1 from the inlet header 4, and the liquid 7 to be heated is guided from the inlet 15 to the outer surface side of each flat tube 1.

〔変形例〕
図６の例では、第１リブ１２及び第２リブ１４が各偏平チューブ１の一端からＬ字状に形成されているが、これに変えて、図５の例と同様に第１リブ１２に平行に補助リブ１８及び補助流路１７を設けることもできる。そして、第３リブ２０をＵターンした被加熱液７を入口パイプ２５と反対側のケーシング側面に設けた出口パイプ２６の出口１６から流出させることができる。 [Modification]
In the example of FIG. 6, the first rib 12 and the second rib 14 are formed in an L shape from one end of each flat tube 1. Instead, the first rib 12 is formed on the first rib 12 in the same manner as in the example of FIG. 5. The auxiliary rib 18 and the auxiliary flow path 17 can be provided in parallel. And the to-be-heated liquid 7 which made the 3rd rib 20 U-turn can be made to flow out from the exit 16 of the exit pipe 26 provided in the casing side surface on the opposite side to the entrance pipe 25. FIG.

１偏平チューブ
１ａプレート
１ｂプレート
２コア
３ケーシング
４入口ヘッダ
５出口ヘッダ
６熱媒体
７被加熱液
８第１熱交換部
９第２熱交換部 DESCRIPTION OF SYMBOLS 1 Flat tube 1a Plate 1b Plate 2 Core 3 Casing 4 Inlet header 5 Outlet header 6 Heat medium 7 Heated liquid 8 1st heat exchange part 9 2nd heat exchange part

１０膨出部
１１第１流路
１２第１リブ
１３第２流路
１４第２リブ
１５入口
１６出口
１７補助流路
１８補助リブ
１９第３流路
２０第３リブ DESCRIPTION OF SYMBOLS 10 Expansion part 11 1st flow path 12 1st rib 13 2nd flow path 14 2nd rib 15 Inlet 16 Outlet 17 Auxiliary flow path 18 Auxiliary rib 19 3rd flow path 20 3rd rib

２１ヘッダープレート
２２チューブ挿通孔
２３フランジ
２４上蓋
２５入口パイプ
２６出口パイプ
２７凝縮液パイプ
２８排気パイプ
２９ディンプル
３０インナーフィン
３１水抜パイプ 21 Header plate 22 Tube insertion hole 23 Flange 24 Upper lid 25 Inlet pipe 26 Outlet pipe 27 Condensate pipe 28 Exhaust pipe 29 Dimple 30 Inner fin 31 Drain pipe

Claims

A casing (3) is fitted on the outer periphery of a core (2) made of a laminate of flat tubes (1), and an inlet header (4) and an outlet header (5) of a heat medium (6) are attached to both ends of the core (2). ) Is placed,
The heat medium (6) flows from the inlet header (4) to the outlet header (5) inside each flat tube (1), and the liquid to be heated is placed outside the flat tube (1) via the casing (3). In the heat exchanger in which (7) is guided and heat is exchanged between the heat medium (6) and the liquid to be heated (7),
The inlet (15) of the liquid to be heated (7) is disposed in the casing (3) adjacent to the inlet header (4), and is downstream of the inlet (15), and the inlet header (4). ) Is provided with an outlet (16) for the liquid to be heated (7),
A first flow path (11) provided in parallel to the inlet header (4) on both outer surface sides in the thickness direction of each flat tube (1), and an end in the flow direction of the first flow path (11) A second flow path (13) provided along one side edge in the width direction of each flat tube (1) in the downstream direction of the heat medium (6),
At the position of the first flow path (11), a first heat exchange section (8) is formed in which the liquid to be heated (7) and the heat medium (6) exchange heat,
The liquid to be heated is positioned downstream of the first heat exchange section (8) in the flow direction of the heat medium (6) and surrounded by the first flow path (11) and the second flow path (13). A second heat exchange section (9) for exchanging heat between (7) and the heat medium (6);
The heated liquid (7) is U-turned from the first flow path (11) to the second flow path (13) and guided to the outlet (16), and the second heat exchange section (9). Then, the heat exchanger which distribute | circulates so that a to-be-heated liquid (7) and a heat medium (6) may become mutually opposing flow.

The heat exchanger according to claim 1,
Each of the flat tubes (1) has a bulging portion (10) that bulges both ends in the longitudinal direction in the thickness direction, and each flat tube (1) is laminated at the bulging portion (10) to form a header plate. Without a header plateless heat exchanger,
Each flat tube (1) is connected to each flat tube (1) through the first flow path (11) provided on both outer surfaces in the thickness direction of the flat tube (1) and parallel to the bulging portion (10). The first rib (12) protrudes to the height of the bulging portion (10) in the direction orthogonal to the flow direction up to one end in the width direction of 1), and the first flow path (11 ) At the position of the first heat exchange part (8),
The downstream end in the flow direction of the heat medium (6) through the second flow path (13) along the one end edge in the width direction of each flat tube (1) from the end of the first rib (12) The second rib (14) protrudes to the height of the bulging part (10) up to the front of the part, and on the downstream side of the first flow path (11), the first flow path (11) and the second flow path A second heat exchange section (9) is formed at a position surrounded by the flow path (13),
The tops of the first ribs (12) of the flat tubes (1) and the tops of the second ribs (14) are in contact with each other, and a guide path for the heated liquid (7) is formed between the flat tubes (1). Formed heat exchanger.

The heat exchanger according to claim 1,
Each of the flat tubes (1) has a bulging portion (10) that bulges both ends in the longitudinal direction in the thickness direction, and each flat tube (1) is laminated at the bulging portion (10) to form a header plate. Without a header plateless heat exchanger,
Each flat tube (1) is connected to each flat tube (1) through the first flow path (11) provided on both outer surfaces in the thickness direction of the flat tube (1) and parallel to the bulging portion (10). The first rib (12) protrudes to the height of the bulging portion (10) in a direction perpendicular to the flow direction until just before the one end in the width direction of 1),
An auxiliary rib (18) is formed via an auxiliary flow path (17) parallel to the first flow path (11) so as to be connected to the end of the first flow path (11). (17) and the first flow path (11) form a first heat exchange section (8),
The width direction of the flat tube (1) from the other end in the width direction of the flat tube (1) of the auxiliary flow path (17) to the front of the downstream end in the flow direction of the heat medium (6). A third flow path (19) is formed along the other edge of the second rib, and a third rib (20) is formed through the third flow path (19).
A second heat exchange section (9) is formed at a position surrounded by the auxiliary flow path (17) and the third flow path (19),
The heated liquid (7) makes a U-turn at the end of the third flow path (19) and is guided to the outlet (16). In the second heat exchange section (9), the heated liquid (7) And a heat exchanger (6) through which the heat medium (6) is circulated so as to face each other.

The heat exchanger according to claim 1,
Each flat tube (1) is a heat exchanger with a header plate in which both ends of the flat tube (1) are inserted into the tube insertion holes (22) of the header plate (21) constituting the inlet header (4) and the outlet header (5). There,
The inner surface of the casing (3) is in contact with both edges in the width direction of each flat tube (1), is provided on both outer surfaces in the thickness direction of each flat tube (1), and is provided in parallel with the header plate (21). The first rib (12) in a direction perpendicular to the flow direction from the inlet (15) to the front of one end in the width direction of each flat tube (1) through the formed first flow path (11). ) Is projected, and the first heat exchange part (8) is formed at the position of the first flow path (11).
The downstream end of the heat medium (6) in the flow direction through the second flow path (13) along the one end edge in the width direction of the flat tube (1) from the end of the first rib (12) The second rib (14) protrudes until just before
A second heat exchange section (9) is formed at a position surrounded by the first flow path (11) and the second flow path (13) on the downstream side of the first heat exchange section (8),
The tops of the first ribs (12) of the flat tubes (1) and the tops of the second ribs (14) are in contact with each other, and a guide path for the heated liquid (7) is formed between the flat tubes (1). Formed heat exchanger.

The heat exchanger according to claim 1,
Each flat tube (1) is a heat exchanger with a header plate in which both ends of the flat tube (1) are inserted into the tube insertion holes (22) of the header plate (21) constituting the inlet header (4) and the outlet header (5). There,
The inner surface of the casing (3) is in contact with both edges in the width direction of each flat tube (1), is provided on both outer surfaces in the thickness direction of each flat tube (1), and is provided in parallel with the header plate (21). The first rib (in the direction perpendicular to the flow direction from the inlet (15) to the front of the one end in the width direction of each flat tube (1) through the formed first flow path (11). 12) is projected,
An auxiliary rib (18) is formed via an auxiliary flow path (17) parallel to the first flow path (11) so as to be connected to the end of the first flow path (11). (17) and the first flow path (11) form a first heat exchange section (8),
The width direction of the flat tube (1) from the other end in the width direction of the flat tube (1) of the auxiliary flow path (17) to the front of the downstream end in the flow direction of the heat medium (6). A third flow path (19) is formed along the other edge of the second rib, and a third rib (20) is formed through the third flow path (19).
A second heat exchange section (9) is formed at a position surrounded by the auxiliary flow path (17) and the third flow path (19) on the downstream side of the first heat exchange section (8),
The heated liquid (7) makes a U-turn at the end of the third flow path (19) and is led to the outlet (16). In the second heat exchange section (9), the heated liquid (7) and A heat exchanger in which the heat medium (6) is circulated so as to face each other.